Dial Tone Generator (CB5984E)

This circuit is from an old documentation making use of a 3,579,645 MHz analog color television crystal. The audio amplifier supports the equivalent.

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1 kW alternating beacon (CB6261E)
This circuit for incandescent light bulbs was suggested by General Electric in a 1980s...
Colpitts Oscillator (MSB047E)
L1 and C1 determine the frequency of this Colpitts Oscillator. Refer to our section Mathematics...
1 kHz Transistor Oscillator 1 (CB12906E)
This oscillator generates a 1 kHz signal, using an old germanium PNP transistor. The circuit was...